Definition
On-premises (on-prem) refers to IT systems installed and operated in an organisation's own physical facilities - as opposed to cloud-based solutions. On-prem provides full control over data and infrastructure but requires investment in hardware, operations, and security updates. In the energy sector, OT systems (SCADASupervisory Control and Data Acquisition - system for real-time monitoring and control of industrial processes., DMSDistribution Management System - system for real-time monitoring and control of the distribution network.) remain typically on-premises for security reasons.